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| 型号： | MAX8668ETEW+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/18页 |
| 文件大小： | 388K |
| 描述： | IC REG QD BCK/LINEAR SYNC 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | 降压（降压）同步（2），线性（LDO）（2） |
| 功能： | 任何功能 |
| 输出数： | 4 |
| 频率 - 开关： | 1.5MHz |
| 电压/电流 - 输出 1： | 0.6 V ~ 3.3 V，600mA |
| 电压/电流 - 输出 2： | 0.6 V ~ 3.3 V，1.2A |
| 电压/电流 - 输出 3： | 3.3V，300mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 2.6 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（3x3） |
| 包装： | 带卷 (TR) |
1.5MHz Dual Step-Down DC-DC Converters
with Dual LDOs and Individual Enables
______________________________________________________________________________________ 11
loads up to 300mA. The LDOs include an internal refer-
ence, error amplifier, p-channel pass transistor, and
internal voltage-dividers. Each error amplifier compares
the reference voltage to the output voltage (divided by
the internal voltage-divider) and amplifies the differ-
ence. If the divided feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
lower, allowing more current to pass to the outputs and
increasing the output voltage. If the divided feedback
voltage is too high, the pass-transistor gate is pulled
up, allowing less current to pass to the output.
Input Supply and Undervoltage Lockout
The input voltage range of LDO regulators OUT3 and
OUT4 is 1.7V to 5.5V. This supply voltage must be less
than or equal to the voltage applied to IN12 (V
IN34
d
V
IN12
).
An undervoltage lockout circuit turns off the LDO regula-
tors when the input supply voltage is too low to guarantee
proper operation. When V
IN34
falls below 1.5V (typ),
OUT3 and OUT4 are shut down. OUT3 and OUT4 turn
on and begin soft-start when V
IN34
rises above 1.6V (typ).
Soft-Start
When initially powered up, or enabled with EN_, the
LDOs soft-start by gradually ramping up the output
voltage. This reduces inrush current during startup. The
soft-start ramp time is typically 100祍 from the start of
the soft-start ramp to the output reaching its nominal
regulation voltage.
Current Limit
The OUT3 and OUT4 output current is limited to 375mA
(min). If the output current exceeds the current limit, the
corresponding LDO output voltage drops.
Dropout
The maximum dropout voltage for the linear regulators
is 250mV at 300mA load. To avoid dropout, make sure
the IN34 supply voltage is at least 250mV higher than
the highest LDO output voltage.
Thermal-Overload Protection
Thermal-overload protection limits the total power dissi-
pation in the MAX8667/MAX8668. Thermal-protection
circuits monitor the die temperature. If the die tempera-
ture exceeds +160癈, the IC is shut down, allowing the
IC to cool. Once the IC has cooled by 15癈, the IC is
enabled again. This results in a pulsed output during
continuous thermal-overload conditions. The thermal-
overload protection protects the MAX8667/MAX8668 in
the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction temper-
ature of +150癈. See the Thermal Considerationssec-
tion for more information.
IN12
ENx
t
PWRON
t
PWRON
IS THE PERIOD REQUIRED TO ENABLE FROM SHUTDOWN
ENy
t
EN
t
EN
IS THE ENABLE TIME FOR SUBSEQUENT ENABLE
SIGNALS FOLLOWING THE FIRST ENABLE
ENx, ENy ARE ANY COMBINATION OF EN1EN4.
OUTx
OUTy
Figure2. Timing Diagram
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| MAX8668ETEX+ | 功能描述:直流/直流开关转换器 1.5MHz Dl Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8668ETEX+T | 功能描述:直流/直流开关转换器 1.5MHz Dl Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8668EVKIT+ | 功能描述:直流/直流开关转换器 MAX8668 Evaluation Kit RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX866C/D | 功能描述:直流/直流开关转换器 3.3V/5V Single-Cell DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX866ESA | 功能描述:直流/直流开关转换器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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